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Y411 yuv pixel format

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I was originally told that this was a duplicate of Y41P however it seems that this is not the case after all. Y411 is a packed YUV 4:1:1 format with a 6 pixel macroblock structure containing 4 pixels. Component packing order is:

U2 Y0 Y1 V2 Y2 Y3

I have not been able to find 100% confirmation of the position for the U and V samples. I suspect that the chroma samples are probably both taken at the position of Y2 but this is a guess just now.

I have recently been informed that this format is identical to IYU1.

  Horizontal Vertical
Y Sample Period 1 1
V Sample Period 4 1
U Sample Period 4 1

Effective bits per pixel : 12

Positive biHeight implies top-down image (top line first)

Child formats: IYU1

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